DELPHINULA. 



GENERIC CHARACTER. 



Shell spiral, subdiscoidal or conic, umbilicated ; whorls 

 rough, foliaceous or angulated on the surface; aperture 

 orbicular, entire ; labia united, often fringed or furnished 

 with a peristome. 



OBSERVATIONS. 



Linne referred the laciniata and distorta. the only spe- 

 cies known to him, to the genus Turbo, in consequence 

 of the rotundity of the aperture ; but Lamarck separated 

 them, and with a number of new species, chiefly fossil, 

 formed the present group. Lamarck obser\^es that they 

 ••evidently approach the Scalarle," and among them, we 

 also see species, of which the spire is loose, and the volu- 

 tions separate. In addition to the above mentioned spe- 

 cies, Lamarck gives one or two others and about ten fossil 

 ones. Defrance enumerates about thirty species. 



PLATE VII. 



